Here is a concise original summary based on the information published by the source. Billionaire tax puts California’s economic future before midterm voters Fox BusinessTwo economists studied California's billionaire tax. They reached wildly different conclusions NPRWhat the voter records of California’s billionaires reveal PoliticoOpinion | Massachusetts has a warning for California and Washington voters The Washington PostBillionaire Sergey Brin is building political infrastructure that will last beyond his $102 million fight against Prop 40 Fortune For the full context and any later updates, use the original source link.